单项选择题

Now that you have a job, you must exert (尽力) yourself in () you do at work.

A. however
B. no matter what
C. no matter how
D. whatever

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单项选择题
I showed him my new dress but I () tell him how much it cost.

A. does not dare to
B. dared not
C. dared not to
D. dares not
单项选择题
Please don't give () my secrets.

A. up
B. off
C. in
D. away
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